• Description

  • Application Data


Cathelicidin family anti-microbial peptide with broad killing spectrum, including Gram-positive and Gram-negative bacteria, fungi, protozoa and HIV.

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Application Data

Catalogue number crb1000022
Molecular Weight 1906.28
Sequence (one letter code)


Sequence (three letter code)


Purity >95%
Storage - 20 ° C

Sur et al (2015) Immune Activation Efficacy of Indolicidin Is Enhanced upon Conjugation with Carbon Nanotubes and Gold Nanoparticles. PLOS ONE 10(4) e0123905 PMID: 25876153.

Pradhan et al (2017) Comparative efficacy analysis of anti-microbial peptides, LL-37 and indolicidin upon conjugation with CNT, in human monocytes. J. Nanobiotechnology 15(1) PMID: 28606090.

Wiesner and Vilcinskas (2010) Antimicrobial peptides: The ancient arm of the human immune system. Virulence 1(5) 440 PMID: 21178486.


Manufactured in: United Kingdom
Data Sheet Material Safety Data Sheet (MSDS)

Indolicidin is a natural cationic cathelicidin family anti-microbial peptide (AMP) with a very wide killing spectrum which includes: Gram-positive and Gram-negative bacteria, fungi, protozoa and HIV.  It is also an immune system modulator and an inhibitor of aminoglycoside antibiotic-resistance enzymes.

Indolicidin contains 5 tryptophan residues (39% of peptide content); the highest tryptophan proportion ever seen in a peptide or protein.

When indolicidin interacts with biological membranes it assumes a wedge- shaped conformation, with the hydrophobic tryptophan residues in the trough of the wedge, and positively charged regions flanking them at each end. If fully extended, indolicidin is able to span both lipid bilayers despite only consisting of 13 amino acid residues. This is possible because indolicidin adopts an approximate poly-l-proline type II helix conformation, which is characterized by very high helical pitches.

The exact mode of action of indolicidin is still unknown. At bactericidal concentrations the peptide appears to translocate through the membrane into the cytosol where it may bind to nucleic acids, whereas at higher concentrations it is membranolytic.


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